bug#42467: 26.3; mark-defun in f90-mode

[Vangelis Evangelou <evangelou@gmail.com>]

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The `mark-defun` function does not work as expected in
f90-mode. Test using the following file:
------- test.f90 ----------------------------------------------
subroutine a

end subroutine a

subroutine b

end subroutine b

subroutine c

end subroutine c

----------------------------------------------------------------

Note: subroutine a must be on line 1 of the text file. Place the cursor
inside subroutine a and execute `mark-defun`. The subroutine is
correctly marked. Now place the cursor inside subroutine b and execute
`mark-defun`. In this case subroutine b and subroutine c are both
marked instead of subroutine b only. Now add a new empty line above
subroutine a, place the cursor inside subroutine a and execute
`mark-defun`.
In this case the whole buffer is marked instead of subroutine a only.


In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll
bars)
 of 2019-12-04 built on vangelis-ThinkPad-T410
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Linux Mint 20

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set [2 times]
Quit
Mark set [2 times]
Quit
Configured using:
 'configure --without-pop --with-x-toolkit=lucid
 --with-file-notification=inotify --with-x --with-modules'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS
GLIB NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT
ZLIB TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD
LCMS2

Important settings:
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: F90

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
mml-sec password-cache epa derived epg epg-config gnus-util rmail
rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils f90 cus-edit easymenu cus-start cus-load
wid-edit cl-loaddefs cl-lib elec-pair time-date mule-util tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win
x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 116755 7641)
 (symbols 48 22249 1)
 (miscs 40 62 129)
 (strings 32 33508 1367)
 (string-bytes 1 874511)
 (vectors 16 15687)
 (vector-slots 8 518839 13116)
 (floats 8 58 79)
 (intervals 56 288 0)
 (buffers 992 13))

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